How to Wire 3-Phase Non-Simultaneous Water Heater Thermostat?

Three Phase Non-Continues Unbalanced Dual Element Electric Water Heater Thermostat Wiring

In our today post, we will be showing three phase non-simultaneous and unbalanced electric water heater thermostats and dual heating elements wiring (480V and 400V AC) in electric water heater wiring and installation series.

We already know the difference between balance and  unbalance (imbalance) three phase water heater wiring discussed in three phase simultaneous water heater wiring, so we will stick to the three phase non-continuous water heater wiring only.

Related Posts:

• How to Wire 3-Phase Simultaneous Water Heater Thermostat?
• How to Wire a Single Element Water Heater and Thermostat?

3-Phase Non-Simultaneous and Unbalanced  Water Heater Thermostat Wiring

Non-simultaneous or non-continuous means that only one heating element and related thermostat operates at a time either lower or upper. In other words, the upper and lower thermostats and heating elements are wired in such a way where both are dependent on each other. When the upper heating element does its job, the wiring configuration automatically disconnects the upper thermostat as well as heating element and connects the lower thermostat and heating element.

Keep in mind that both the lower and upper thermostats are ECO-protected i.e. both are the same. In this wiring connection, the Line 1 (Black) is connected to the upper thermostat terminal L₁ and latter L₃ terminals of lower thermostat via terminal T₄ of upper thermostat. Line 2 (Red) is connected to the L₃ terminal of the upper thermostat and Line 3 (Blue) is directly connected to the L₁ of lower thermostat.